Study on gas-barrier properties of polyvinyl glutaral membranes

Gas-barrier material-polyvinyl alcohol (PVA) of multilayer laser microsphere was cross linked by glutaraldehyde (GA) in order to improve the gas-barrier properties of microsphere. Different content of GA, from 300 μL to 1 700 μL were added into the identical blended solutions of 10 mL, 3% PVA and 20 μL hydrochloric acid. Gas-barrier properties of polyvinyl glutaral (PVG) membranes was measured after cross linking reaction and permeability coefficient of PVG membranes was worked out. It was found that PVG′s permeability coefficient first decreases, and then increases, then keeps stead, at last increases with the increase of GA content in PVG membranes . Moreover, when GA content is 800 μL, the permeability coefficient of PVG film is the minimum with the best gas-barrier properties.